CN1190476C - Cracking purification method for combustible gas produced by gasifying crude material - Google Patents
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Abstract
The present invention relates to a method for cracking and purifying combustible gas produced by biomass gasification. The method orderly comprises the following steps that (a) the combustible gas is cracked at high temperature and catalytically cracked in a charcoal layer with the high temperature of 800 to 1200 DEG C through a movable bed cracking device to remove most of tar in the combustible gas; (b) the heat of the combustible gas is exchanged so that the temperature of the combustible gas is reduced to 300 to 350 DEG C from 800 DEG C; (c) dust in the combustible gas is electrostatically removed in a high-voltage electric field with 80000 volts and the temperature is reduced to 250 to 300 DEG C; (d) the combustible gas is cleaned by high-speed water jets from a venturi pipe, removed from dust and tar and cooled and the temperature of the combustible gas is reduced to 60 to 80 DEG C; (E) the combustible gas is washed by water in a spraying tower, filtered and cooled, the temperature of the combustible gas is reduced to less than 40 DEG C of environment temperature, and the content of the tar and the dust in the combustible gas is reduced to less than 50 mg per standard cubic meter. The present invention can thoroughly remove the dust, the tar, etc. in the combustible gas and has no secondary environmental pollution.
Description
Technical field
The present invention relates to the combustible gas cracking purification method that a kind of gasifying biomass produces.
Background technology
China's biomass reserves are very abundant, and energy utilization can realize CO as an alternative
2Zero release alleviates Greenhouse effect and acid rain pollution simultaneously greatly.Since volatile content height in the biomass, the active height of charcoal, and current domestic and international efficient utilization about biomass mainly concentrates on pyrolytic gasification generation combustible gas and comes air feed and generating.Ciculation fluidized bed biomass gasifying adaptability to raw material is strong, and bed temperature is even, and production intensity is big, the gas heating value height, and gasification efficiency is higher.But the subject matter that exists is that the fine particle ash carries seriously, and the tar that gasification produces is more, causes the gas-purification difficulty, stops up and corrosion pipeline, and influences the works better of oil engine or internal combustion turbine.
Contain a certain amount of dust and tar in the gasifying biomass combustible gas, it purifies and mainly comprises methods such as cyclonic separation dedusting, washing, material filling type filtration, thermo-cracking and catalytic pyrolysis.Patent CN 2281833Y utilizes the material filling type strainer to remove tar; CN1260377A utilizes dust to separate the tar that removes in the combustion gas as the nucleus of condensation with the physics suspension settlement; CN 2372044Y will wash and the material filling type strainer combines purifies tar; CN1258712A constitutes the gas-purification system jointly by cyclonic separator, Venturi tube and water wash column; CN 2451911Y carries out adsorption removal tar with combustion gas by the pyrolytic tar in the biomass pyrolytic gas retort that links to each other.
The most frequently used method is to take simply to wash the treatment and purification combustion gas at present, and the existence owing to a large amount of tar in the combustion gas not only causes the severe contamination of washing water, and is unfavorable for the efficient operation of gasification power generation system, and waste energy and resource.Material filling type filters and occurs the filler obstruction easily, and the tar of covering surfaces is difficult to cleaning.External catalytic pyrolysis or the Pintsch process taked usually reduces tar content (C.M.Kinoshita in the combustion gas, etc.Joural of Analytical and Applied PyroysisVol.29 (1994), 168-181), though the tar of catalytic pyrolysis cleavable more than 90%, but technical sophistication, easy carbon distribution inactivation of catalyzer and S poison, and Application of Catalyst increases the combustion gas production cost greatly; Pintsch process is a cost with the part calorific value of sacrificing combustion gas often, produces the high-temperature zone by the combustion parts combustible gas and decomposes tar.Above-mentioned technology all can't thoroughly be removed dust and the tar in the combustible gas.
The content of invention
The objective of the invention is to purify not exclusively in order to overcome prior art, perhaps technical sophistication, easy carbon distribution inactivation of catalyzer and S poison, and the shortcoming that Application of Catalyst increases the combustion gas production cost greatly, the combustible gas cracking purification method that provides a kind of novel gasifying biomass to produce, it is with the high-temperature catalytic cracking, the combustion gas heat exchange, static is caught dirt, Venturi tube is cleaned cooling, the cooling of spray column washing filtering organically combines, combustible gas is purified fully, satisfy the needs of oil engine generating, heat in the combustible gas of effective recycling does not simultaneously cause secondary pollution to environment.
The combustible gas cracking purification method that gasifying biomass of the present invention produces comprises the following steps: successively
(a) high-temperature catalytic cracking: biomass gasifying furnace gasification produces contains the inflammable gas of 500 ℃-600 ℃ of tar and dust, temperature by the moving-bed cracker, in 800-1200 ℃ of pyritous art charcoal layer, carry out Pintsch process and catalytic pyrolysis, remove most of tar in the combustion gas;
(b) combustion gas heat exchange: it is that the heat exchange of preheating of air (cooling) device cools that combustion gas enters heat exchanger, makes fuel gas temperature reduce to 300-350 ℃ by 800 ℃;
(c) electrostatic precipitation: by the electrostatic precipitator of 80,000 volts of high-voltage electric fields, remove most of dust, the inflammable gas temperature is reduced to 250-300 ℃ simultaneously;
(d) Venturi tube is cleaned cooling: through the cleaning of Venturi tube high-speed water jet, and dedusting decoking and cooling, fuel gas temperature is reduced to 60-80 ℃;
(E) spray column washing filtering cooling: successively enter two washing spray columns, repeat washing, filtration, decoking, dedusting, cooling, the temperature of inflammable gas is reduced to envrionment temperature below 40 ℃, and combustion gas is coal-tar middle oil, dust content is reduced to 50mg/Nm
3Below (milligram/standard cubic meter), reach the requirement of combustion gas degree of cleaning.
(a) high-temperature catalytic cracking in the combustible gas cracking purification method that described gasifying biomass produces is a built-in small catalyst particles charcoal in the moving-bed cracker, from the air lead bubbling air, and igniting precombustion lower floor charcoal, making it to heat up reaches 800-1200 ℃; The combustible gas that the input gasifying biomass produces by red red carbon layer, carries out Pintsch process and catalytic pyrolysis, makes tar partly resolve into CH
4, H
2, CO, CO
2Micro-molecular gas; Through upper strata charcoal layer, filter the decoking dedusting again, the tar in the combustion gas is removed 70-80%; Afterwards, temperature is about 800 ℃ inflammable gas and exports through top, and being transported to heat exchanger is in preheating of air (cooling) device; Meanwhile, the charcoal layer in the pyrolyzer moves down gradually, and the tar that is adsorbed by charcoal layer also moves down with the charcoal layer, burned, cracking; Lower floor's charcoal is incinerated, and is discharged by the bottom; New charcoal constantly adds additional from the top charging opening, to keep the thickness of charcoal layer in the stove, normal continuously operation.
(b) combustion gas heat exchange in the combustible gas cracking purification method that described gasifying biomass produces, be high-temperature fuel gas to enter heat exchanger be preheating of air (cooling) device, with freezing air sufficient heat exchange in interchanger, make fuel gas temperature reduce to 300-350 ℃; And after freezing air is warming up to 100-180 ℃, from air output, supplies with vapourizing furnace or pyrolyzer and use.
(c) electrostatic precipitation in the combustible gas cracking purification method that described gasifying biomass produces, be combustion gas by inlet mouth, through the heatproof air inlet duct, it is indoor to enter electric precipitation with the low flow velocity of 0.7-1.2 meter per second; Under 80,000 volts of high-voltage electric field effects of negative electrode suspention input, at negative electrode negative high voltage place, the point discharge flow of emitted electrons, make by the grit in the combustion gas of this electric field to combine, become the ion particle flux of on-load, together rush at anode with negatron, the grit of on-load is attracted on the anode, be subjected to the rapping apparatus vibration to fall into ash bucket, remove the 90-98% dust, simultaneously the inflammable gas temperature is reduced to 250-300 ℃.
(d) Venturi tube in the combustible gas cracking purification method that described gasifying biomass produces is cleaned cooling, be after combustion gas enters surge chamber from the Venturi tube inlet pipe, vertically downward, with mix mutually from the high-speed water jet of moisture film water-jet through nozzle ejection, again through reducing pipe, trunnion, shrink and quicken, at this place's thorough mixing; Afterwards, combustion gas and water jet are through increaser, gas-liquid separator separates combustion gas and liquid, lime-ash, and water and lime-ash sedimentation are discharged by deslagging (liquid) pipe.
(E) spray column washing filtering cooling in the combustible gas cracking purification method that described gasifying biomass produces, be that combustion gas is successively moved from bottom to top from two washing spray columns, through two layers of packing layer (being selected from charcoal, wood or bamboo piece) Filtration Adsorption, and the water jet thorough mixing that ejects with nozzle, carry out heat exchange, the ponding of Ta Nei lower floor superelevation, automatically discharge from upflow tube, lime-ash is discharged from scum pipe, last fuel gas temperature is reduced to envrionment temperature below 40 ℃, grit in the combustion gas, tar content reduce to 50 milligrams/below the standard cubic meter.
The employed associated plant of combustible gas cracking purification method that gasifying biomass of the present invention produces comprises that moving-bed cracker, heat exchanger are two of preheating of air (cooling) device, electrostatic precipitator, Venturi tube and washing spray columns; The fuel gas inlet pipe connection of the gas outlet of the previous equipment of six independent meanss and a back equipment forms complete associated plant.
Described moving-bed cracker is to adopt fixed-bed gasification furnace, and it comprises housing, body of heater, charging opening, taper air distribution plate, blower fan, spiral ash discharging hole, motor; Its profile is the garden tubular, and housing is a steel construction, and inwall is a refractory insulating layer; Body of heater is a round shape, and the bottom is a back taper, and the middle part of stove is a cracking zone, establishes catalyzer charcoal (small-particle) layer, thickness 2500-4000mm; Pyrolyzer top is loading hopper; Air distribution plate plays even distributing wind and supports the effect of charcoal layer in the charcoal layer bottom, and it is peripheral for all pressing the chamber; Foot is ash discharging hole and spiral ash ejector, and the below, left side of pyrolyzer is provided with gas inlet, and opposite side top is provided with gas outlet; Intake stack is located at the lower side of stove and links to each other with blower fan.
Described heat exchanger is that preheating of air (cooling) device is to be the rectangular parallelepiped efficient heat exchanger of refrigerant with the air, comprise housing and Heat Room, one square fuel gas inlet is arranged at top, Heat Room is arranged 400-500 root heat transfer tube, the bottom is square gas outlet, Heat Room inside is from spaced intermediate, lower part is connected with tubaeform inlet of cold air, upper part is connected with hot air outlet, the opposite side of Heat Room has the air return flow line, connect the upper and lower part Heat Room, get back to the first half after freezing air can be entered by Lower Half.
Described electrostatic precipitator is box-shaped shell, heatproof air inlet duct, ash bucket, negative electrode suspention, protective case, the spiral discharge apparatus that comprises loading electrode system in the middle part; Electrode system by multipole horizontal stagger arrangement flute profile positive plate and in the flute profile positive plate perverse and garden line corona discharge electrode (negative electrode) of gating form; This system is a frame shape, is suspended in the box-like body, and is connected also external 80,000 volts of high voltage supply systems with negative electrode suspention that dust remover roof is fixed on the upper housing; Fuel gas inlet and heatproof air inlet duct are located at casing one side, and gas outlet is located at the other end; Box house is equipped with spoiler and smoke stop plate, in the pole plate framework outside rapping apparatus (not marking among the figure) is housed also; The bottom is taper ash bucket and the spiral discharge apparatus that is attached thereto; Ash bucket is connected with housing.Used high temperature material is heat-resisting boiler steel, and used corrosion resistant material is a pottery.
Described Venturi tube is made up of top venturi nozzle and bottom gas-liquid separator two parts; Venturi nozzle is made up of inlet pipe, surge chamber, moisture film water-jet, reducing pipe, trunnion, increaser and some nozzles; The gas-liquid separator side has an escape pipe, bottom that one scum pipe is arranged.
Described washing spray column (two structures are identical) is the garden tubular, and two layers of filler filtering layer are arranged in (each) tower, last filler filtering layer and following filler filtering layer; Respectively there are one group of nozzle, top nozzle and bottom nozzle in the filtering layer top; The side, below of following filler has individual inlet mouth, cat head that individual air outlet is arranged, and the bottom of tower is with upflow tube and scum pipe.
Advantage of the present invention and positively effect are:
(1) adopts charcoal to make the moving-bed cracker of catalyzer, realize tar Pintsch process, catalytic pyrolysis and three functions of dust removal by filtration simultaneously;
(2) make catalyzer with charcoal, when realizing coke tar cracking; The assurance fuel gases calorific value is stable;
(3) utilize the air cooling high-temperature fuel gas, the control fuel gas temperature had both effectively been recycled the heat in the combustible gas at 300-350 ℃, made combustion gas be suitable for electric dust-removing equipment again, avoided tar to condense again, influenced the operation of electric precipitator;
(4) design is suitable for 300-350 ° electric precipitator, separates the dust impurity in the combustion gas under middle temperature;
(5) high-temperature catalytic cracking, static dust catcher, Venturi tube and water wash column are organically combined, dust in the combustible gas, tar etc. are thoroughly removed, environment is not produced secondary pollution.
(6) produce combustible gas with the gasification of biomass circulating fluid bed and come air feed and generating, adaptability to raw material is strong, production intensity is big, the gasification efficiency height, can make full use of domestic biomass waste material, environmental benefit is obvious, and combustible gas purifying is one of its key technologies for application, thoroughly remove dust and tar in the combustible gas, application of the present invention will make the market application potential of biomass circulating fluid bed gasifying electricity generation technology increase greatly.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.Fig. 2 is an associated plant structural representation of the present invention.
Embodiment
Present embodiment is the ciculation fluidized bed biomass gasifying of 3MW power house, adopt combustion gas cracking purification method of the present invention and associated plant, the tar that contains with circulating fluidized bed biomass gasifying furnace gasification generation, the inflammable gas of dust carries out cracking and purifies, and purifies the clean inflammable gas in back and supplies with 6 500KW fuel gas generation unit generatings.
The combustible gas cracking that the gasifying biomass that embodiment adopts Fig. 2 to show produces purifies associated plant, and it comprises that moving-bed cracker I, heat exchanger are preheating of air (cooling) device II, electrostatic precipitator III, Venturi tube IV and washing spray column V and VI; The fuel gas inlet pipe connection of the gas outlet of the previous equipment of six independent meanss and a back equipment forms complete associated plant.
Moving-bed cracker I adopts fixed-bed gasification furnace, D4500mm, and H7000mm, it comprises housing I-4, body of heater I-6, charging opening I-7, taper air distribution plate I-11, blower fan I-13, spiral ash discharging hole I-14, motor I-15; Its profile is the garden tubular, and housing I-4 is a steel construction, and inwall is refractory insulating layer I-5; Body of heater I-6 is a round shape, and the bottom is a back taper, and the middle part of stove is a cracking zone, establishes catalyzer charcoal (small-particle) layer I-9, thickness 3500mm; Pyrolyzer top is loading hopper I-7; Air distribution plate I-11 plays even distributing wind and supports the effect of charcoal layer in the charcoal layer bottom, and it is peripheral for all pressing chamber I-2; Foot is ash discharging hole I-1 and spiral ash ejector I-14, and the below, left side of pyrolyzer is provided with gas inlet I-3, and opposite side top is provided with gas outlet I-8; Intake stack I-10, I-12 are located at the lower side of stove and link to each other with blower fan I-13.
Preheating of air (cooling) device II, be to be the rectangular parallelepiped efficient heat exchanger of refrigerant with the air, be of a size of 1320 * 1244 * 3396, comprise housing II-8 and Heat Room II-4, one square (1080 * 1140) fuel gas inlet II-5 is arranged at top, Heat Room II-4 arranges 450 heat transfer tube II-3, the bottom is square gas outlet II-1, Heat Room inside is from spaced intermediate, lower part is connected with tubaeform inlet of cold air II-7, and upper part is connected with hot air outlet II-6, and the opposite side of Heat Room II-4 has air return flow line II-2, in the connection, the bottom Heat Room is got back to the first half after freezing air can be entered by Lower Half.
Electrostatic precipitator III is box-shaped shell, heatproof air inlet duct III-1, ash hopper I II-2, negative electrode suspention III-7, protective case III-12, the spiral discharge apparatus III-13 that comprises loading electrode system in the middle part; Electrode system by multipole horizontal stagger arrangement flute profile positive plate III-4, III-9 and in the flute profile positive plate perverse and garden line corona discharge electrode (negative electrode) III-5 of gating form: this system is a frame shape, be suspended in the box-like body, and be connected also external 80,000 volts of high voltage supply systems with negative electrode suspention III-7 that dust remover roof is fixed on the upper housing; Fuel gas inlet III-6 and heatproof air inlet duct III-1 are located at casing one side, and gas outlet III-10 is located at the other end; Box house is equipped with spoiler III-3, III-11 and smoke stop plate III-8, in the pole plate framework outside rapping apparatus (not marking among the figure) is housed also; The bottom is taper ash hopper I II-2 and the spiral discharge apparatus III-13 that is attached thereto; Ash hopper I II-2 is connected with housing III-12.Electrostatic precipitator adopts heat-resisting boiler steel of high temperature material and corrosion resistant material pottery.
Venturi tube IV is made up of top venturi nozzle and bottom gas-liquid separator two parts; Venturi nozzle is made up of inlet pipe IV-1, surge chamber IV-2, moisture film water-jet IV-3, reducing pipe IV-5, trunnion IV-6, increaser IV-7 and some nozzle IV-4; Gas-liquid separator IV-8 side has an escape pipe IV-9, bottom that one scum pipe IV-10 is arranged.
Washing spray column V is the garden tubular with VI (VI is identical with the V structure), and D=2000mm, H=10600mm have two layers of filler filtering layer in (each) tower, every bed thickness 350mm, last filler filtering layer V-4 or VI-4 and following filler filtering layer V-6 or VI-4; Respectively there are one group of nozzle, top nozzle V-3 or VI-3 and bottom nozzle V-3 or VI-3 in the filtering layer top; The side, below of following filler V-3 or VI-3 has individual inlet mouth V-1 or VI-1, cat head that individual air outlet V-2 or VI-2 are arranged, and the bottom of tower is with upflow tube V-7 or VI-7 and scum pipe V-8 or VI-8.
Whole cracking scavenging process is as follows: be built-in small catalyst particles charcoal I-9 in the moving-bed cracker, and from air lead I-10 bubbling air, igniting precombustion lower floor charcoal, making it to heat up reaches 800-1200 ℃; The combustible gas that the input gasifying biomass produces by red red carbon layer, carries out the high-temperature catalytic cracking, and part resolves into CH
4, H
2, CO, CO
2Micro-molecular gas; Through upper strata charcoal layer, filter the decoking dedusting again, the tar in the combustion gas is removed 70-80%; Afterwards, temperature is about 800 ℃ inflammable gas and exports I-8 through top, and being transported to heat exchanger is in preheating of air (cooling) utensil; Meanwhile, the charcoal layer in the pyrolyzer moves down gradually, and the tar that is adsorbed by charcoal layer also moves down with the charcoal layer, burned, cracking; Lower floor's charcoal is incinerated, and is discharged by bottom I-1, I-14; New charcoal constantly adds additional from top charging opening I-7, to keep the thickness of charcoal layer in the stove, normal continuously operation.It is preheating of air (cooling) utensil that high-temperature fuel gas enters heat exchanger, with freezing air sufficient heat exchange in interchanger, makes fuel gas temperature reduce to 300-350 ℃; And after freezing air is warming up to 100-180 ℃, from air II-6 output, supplies with vapourizing furnace or pyrolyzer and use.Combustion gas is by inlet mouth III-6, and it is indoor to enter electric precipitation through heatproof air inlet duct III-1 with the low flow velocity of 1 meter per second; III-7 imports under 80,000 volts of high-voltage electric field effects in the negative electrode suspention, at negative electrode III-5 negative high voltage place, the point discharge flow of emitted electrons, make by the grit in the combustion gas of this electric field to combine, become the ion particle flux of on-load, together rush at anode III-4, III-9 with negatron, the grit of on-load is attracted on the anode, be subjected to the rapping apparatus vibration to fall into ash hopper I II-2, remove about 90-98% dust, simultaneously the inflammable gas temperature is reduced to 250-300 ℃.After combustion gas enters surge chamber IV-2 from Venturi tube inlet pipe IV-1, vertically downward, and mix mutually through the high-speed water jet of nozzle IV-4 ejection, again through reducing pipe IV-5 trunnion IV-6, shrink and quicken, at this place's thorough mixing from moisture film water-jet IV-3; Afterwards, combustion gas and water jet separate combustion gas and liquid, lime-ash through increaser IV-7, gas-liquid separator IV-8, water and lime-ash sedimentation, and IV-10 discharges by deslagging (liquid) pipe.Combustion gas is successively moved from bottom to top from the inlet mouth V-1 of two washing spray column V or the inlet mouth VI-1 of VI, through two layers of charcoal packing layer V or VI-6, V or VI-4, Filtration Adsorption, and with nozzle V or VI-5, the water jet thorough mixing that V or VI-3 eject, carry out heat exchange, the ponding of Ta Nei lower floor superelevation, automatically discharge from upflow tube V or VI-7, lime-ash is discharged from scum pipe V or VI-8, last fuel gas temperature is reduced to envrionment temperature below 40 ℃, grit in the combustion gas, tar content reduce to 50 milligrams/below the standard cubic meter, inflammable gas can be supplied with the generating of 6 500KW fuel gas generation units.
Claims (6)
1. the combustible gas cracking purification method that gasifying biomass produces comprises the following steps: successively
(a) high-temperature catalytic cracking: biomass gasifying furnace gasification produces contains the inflammable gas of 500 ℃-600 ℃ of tar and dust, temperature by moving-bed cracker (I), in 800-1200 ℃ of pyritous charcoal layer (I-9), carry out Pintsch process and catalytic pyrolysis, remove most of tar in the combustion gas;
(b) combustion gas heat exchange: it is that air preheater (II) heat exchange cools that combustion gas enters heat exchanger, makes fuel gas temperature reduce to 300-350 ℃ by 800 ℃;
(c) electrostatic precipitation: by the electrostatic precipitator (III) of 80,000 volts of high-voltage electric fields, remove most of dust, the inflammable gas temperature is reduced to 250-300 ℃ simultaneously;
(d) Venturi tube is cleaned cooling: through the cleaning of Venturi tube (IV) high-speed water jet, and dedusting decoking and cooling, fuel gas temperature is reduced to 60-80 ℃;
(E) spray column washing filtering cooling: successively enter two washing spray columns (V and VI), repeat washing, filtration, decoking, dedusting, cooling, the temperature of inflammable gas is reduced to envrionment temperature below 40 ℃, combustion gas is coal-tar middle oil, dust content reduce to 50 milligrams/below the standard cubic meter, reach the requirement of combustion gas degree of cleaning.
2. combustible gas cracking purification method according to claim 1, it is characterized in that (a) high-temperature catalytic cracking wherein, it is built-in small catalyst particles charcoal layer (I-9) in the moving-bed cracker (I), from air lead (I-10) bubbling air, igniting precombustion lower floor charcoal, making it to heat up reaches 800-1200 ℃; The combustible gas that the input gasifying biomass produces by red red carbon layer, carries out Pintsch process and catalytic pyrolysis, makes tar partly resolve into CH
4, H
2, CO, CO
2Micro-molecular gas; Through upper strata charcoal layer, filter the decoking dedusting again, the tar in the combustion gas is removed 70-80%; Afterwards, temperature is about 800 ℃ inflammable gas through top outlet (I-8), is transported in the air preheater (II); Meanwhile, the charcoal layer in the pyrolyzer moves down gradually, and the tar that is adsorbed by charcoal layer also moves down with the charcoal layer, burned, cracking; Lower floor's charcoal is incinerated, and is discharged by bottom (I-1, I-14); New charcoal constantly adds additional from top charging opening (I-7), to keep the thickness of charcoal layer in the stove, normal continuously operation.
3. combustible gas cracking purification method according to claim 1 is characterized in that (b) combustion gas heat exchange wherein, is that high-temperature fuel gas enters air preheater (II), with freezing air sufficient heat exchange in interchanger, makes fuel gas temperature reduce to 300-350 ℃; And after freezing air is warming up to 100-180 ℃, from air (II-6) output, supplies with vapourizing furnace or pyrolyzer and use.
4. combustible gas cracking purification method according to claim 1 is characterized in that (c) electrostatic precipitation wherein, be combustion gas by inlet mouth, through the heatproof air inlet duct, it is indoor to enter electric precipitation with the low flow velocity of 0.7-1.2 meter per second; Under 80,000 volts of high-voltage electric field effects of negative electrode suspention input, at negative electrode negative high voltage place, the point discharge flow of emitted electrons, make by the grit in the combustion gas of this electric field to combine, become the ion particle flux of on-load, together rush at anode with negatron, the grit of on-load is attracted on the anode, be subjected to the rapping apparatus vibration to fall into ash bucket, remove the 90-98% dust, simultaneously the inflammable gas temperature is reduced to 250-300 ℃.
5. combustible gas cracking purification method according to claim 1, it is characterized in that (d) Venturi tube cleaning cooling wherein, be after combustion gas enters surge chamber (IV-2) from Venturi tube (IV) inlet pipe (IV-1), vertically downward, with mix mutually from the high-speed water jet of moisture film water-jet (IV-3) through nozzle (IV-4) ejection, through reducing pipe (IV-5), trunnion (IV-6), shrink and quicken again, at this place's thorough mixing; Afterwards, combustion gas and water jet separate combustion gas and liquid, lime-ash through increaser (IV-7), gas-liquid separator (IV-8), and water and lime-ash sedimentation are discharged by deslagging (liquid) pipe (10).
6. according to the described any combustible gas cracking purification method of claim 1-5, it is characterized in that (E) spray column washing filtering cooling wherein, be that combustion gas is successively moved from bottom to top from two washing spray columns (V or VI), through two layers of packing layer (V or VI-6, V or VI-4,) Filtration Adsorption, and with nozzle (V or VI-5, V or VI-3) the water jet thorough mixing that ejects, carry out heat exchange, the ponding of Ta Nei lower floor superelevation, automatically discharge from upflow tube (V or VI-7), lime-ash is discharged from scum pipe (V or VI-8), last fuel gas temperature is reduced to envrionment temperature below 40 ℃, the grit in the combustion gas, tar content reduce to 50 milligrams/below the standard cubic meter.
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-
2002
- 2002-09-28 CN CNB021348502A patent/CN1190476C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103205285A (en) * | 2013-03-29 | 2013-07-17 | 合肥德博生物能源科技有限公司 | Biomass gas purifying and cooling method |
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